<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title>变量</title>
		<script>
			var a=3;
			confirm(a);
			a="assas";
			alert(a);
		</script>
		
		
		<h1>haha</h1>
	</head>
	<body>
	</body>
</html>